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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50eaed6c6b78aae2d0f048c1798c2392d11e7fc694a77b65c101418c4b33d03' 
  AND token = 'AxpvWEFAWv3T8gQC0eu0/snqq8egIP54oQRIl66xuTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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