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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba465ba7f831cbbb2e11e6dad4482e149ee39bd8be3a02eebada07821eac0fee' 
  AND token = 'gvj2g39bn2vUhw9BAUhsSq5PTFFLtBYeEqjRXJJabns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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