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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f950d8e9f34cf911b51b58077f22d4856e60a0933f65dde3d823512a3aafc07' 
  AND token = 'rqZfvWaG+n6tIUEnGx40kSTMU/9cVHPoM/H/1PQpXsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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