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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0bc16f4e636d3f94cb817e7acd79b78c8fc8a6ad4442cfa8d5825ae1d0b382' 
  AND token = 'o1jQq56DP5ESIE7pHl6d9myMpzwU1rAgPWJa0Efh5Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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