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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40795d14e2663b0fd3a72396b2c89c9916c5a22e8e52e26cb7f1b6960d739794' 
  AND token = 'pSstdoE2eF1+us0DanIxuVWzjRdP1SIa/6FThWFwR+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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