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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc2ac9432e7f5a2460276bbfd7651a8f54a024cd3e02c0b8468b2974976e909' 
  AND token = 'Qhs7YZnS8ucZ9Gyj2QnV2rYuDzU8XSBl+s+Q8shSIe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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