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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d36ce8dc27f78ad1367cdfea0842b279acd76a0aecc727136b7b7d3e9941eb' 
  AND token = 'qgTNHQdED/nVDXHbo1Vj9oOui8PcsMh1vri/GZc/D1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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