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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcc30bc471605bb37880527d084ec00d709c6b26bad0268e2dd761be663d063' 
  AND token = 'l2qovTRndKhpB2IXLqocfCRt4VecWzUMTkQ9HsyOf5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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