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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bb139c5c3800f6b67d7e2bbd4bca8e54de3d10cd0e1cc5e7af380734e65458' 
  AND token = 'crr2ZR9GmeJvfSOz7HkxVZx8NdybtO/GO8fC23/3jWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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