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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fb1392950e04f53a4e6e137f525d4de60b0b4f70711704d9a0aa32972d61a2' 
  AND token = 'NkMDYfbKxhli4r9ajZyi34XM4QboCBI/ICRKGOQtyn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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