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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e789d2a209fe9a2ec0a65dd3a83daad6b24d9b1ec95db7e62c33561cd19bd5' 
  AND token = '1VLdFp5WXUzQ/LaICIInrzMvFB5iy2YoCCSa6k8Bnno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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