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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a76c15c3c7e4a12fb26c09a7f3b261e357f45c4734f9ea834244a90d807958e' 
  AND token = 'vXK7zRX6u6PEbMLd2fFAnBx8OxvamNtHgpQa/sz7fcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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