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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9890c67ac10db2cd8fe88edf5c53d96e639e8736d5bcf9916b495300289612' 
  AND token = 'aX0yLdxozNVxEQqmOtwtOhD7+9XRekT92H5nhDmvCvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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