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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70db2517791010bb6725a8a5c2deb7e923c1b2b6b4de945dad0992894dde0007' 
  AND token = 'G7ih6dCdSKNwdFJfEI9ru/r2dVMV+QVKrBLZfUhT9IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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