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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddf1176820d4d7f65aca94150985d1a3aea10f124a08697af35111a0959d405' 
  AND token = 'uNrCDsm7i2bC6fOAcEATwjwgC3AEkD4WiNzncsil/L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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