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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3ee51e4fac89f022b717eca9aa52fbc9cef026fa2609c06c347eec980675d0' 
  AND token = 'hD6AOTkR43If1/RJXDduRuVWWZTvstp0lGXf2aAXFG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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