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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011f9b593cd5533a069597157ab8bfa9550dd8ca7b2605b018b90dc6507f8059' 
  AND token = '9RNPJNXexckC6OkTP1Bsnc1A2L/fzN0Fh+VNnja0MfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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