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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfb4fc93bd97ffb77c7336233eb6bec6c5b3de9116bff5b6180f26e7683c68b' 
  AND token = 'vbBij2uc+QEDEYAYjqmB7kGFFWwCNTmoK2MfWnc3pYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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