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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d708aa1e2b6a31d5742b8692b8d79cf274bb3a2d9e3635d730b28611ee6b06' 
  AND token = 'PuDA8l1wmX34oAwygYq2o2aEOEUTd+oU/OGi3pA6E7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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