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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63273e23036bfc2f2eb79f31e05aca1ac62066bd5a1e1e6a991759fe15e5acf' 
  AND token = 'V4kwQsxmj7FxDuGfhapKEO+lVFOw618fUAZ58uJNt3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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