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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88135f65c07c8a5a7c229cb32bc56ed48adac13ec43cef16570f41b07649bad1' 
  AND token = 'n/qA8Xk8Rp+1wbT/z9Ms0gQ/hFbfzIqGVtSN7ONLShs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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