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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87dd5b6b1c2a7ecf4b900abde6f3dddfb3e584de17a5e2b0ef68e43c72ec4a7' 
  AND token = 'jxRT4NmHBF43Kjom2IvD9sTmI2kWE+Qwp70cf23RwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}