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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d87d131d4c2575e84913f07b1cab70be5e11e938a8e3477605d1d2577a2583' 
  AND token = 'bkhDPVOekjLODGNdDfzSzJNXichO8hmmB3GsGcLjZI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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