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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91638ae974ca88ac5efd83978c5e79459607f8410d84c8ad6887890b6e00b7e' 
  AND token = '7mbPsLI7T7b96K41jOGPRnPzxvoJRR9iLkq0sIWq2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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