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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55f2993d7656aacd29c3f70402caa579445b91bd4b448a745629f8afd72f14a' 
  AND token = 't4sHbeqJK9QfnMpfSsv7PMw0pFooXH6+F0ud6spbuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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