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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb5402f1e9d23482f304317d8f64b991394e3495915488297e99af86f05796e' 
  AND token = 'McyBFvnB9Cyf6WB9gMRRtf0NNKjs7QwWQ/s9S4U4esQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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