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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1961a828593c46e06bfcdf68c8b2cdf484946c4cf1bed86ae2f034877d6ed14' 
  AND token = 'kGig1uE+/9tfdfAFqrLAUbWl3MHMmJDPt0Kpw5lz55k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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