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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eb02789560166617cc8308a037b9e820024100ecca8c8148cbb1ab9c01fe8e' 
  AND token = 't2L/gvEwW7oEFPehURzdk5hz7P7nj3s3HnrtbjXmd7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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