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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2de8af09011e38151390ef0c3fc22db6cdc5dd65c8cc29815650584fb631df' 
  AND token = 'EhDkKIBF4LlQlmdF2kruv+2SqrIEq/bCJTMFbpiJJEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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