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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a02652b24e2286c582035fd4674f2aebe3844829992fd0a70c06ac63381755f' 
  AND token = 'e++wWUnSVHk9i/3nLG0a32XGyaBYPSBILw5E6FlBy3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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