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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffd4fd06eb166d81e719eaccc78c205ff919131578e03c3a87c7607e6f2ad6d' 
  AND token = 'mro9SNdvSlPwcE0zvb2t5BayVbwpmv+TE7LhMnYl37k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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