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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd518fc1b7254683f6b3fd3e8c800c78d888e51d62e86501c5ace322d3910c60' 
  AND token = 'RwaMiywBIYXuVYT3PlomPPbAXueQ4k9mpAb15xoz0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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