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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b38247c3c038e0ae89b99d057a66e6e24103744839dd5b827b33da032bf0c30' 
  AND token = 'UCL4LB1zKW+zf/l62rYpdsX1TMqvfEk20ufI7uLwckk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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