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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34203cc44c6ba8d087d3959a81a5c22114195cdaf1320591f19456f539382fcb' 
  AND token = 'nP425mbsQrc+LSGh5YYNoj17WSwN1po5ahO+acoL/q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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