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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bcd0c89493d2d2b0f3bccd0a4a3a8113aab9abb0aa094224556ec6e40eeb2f' 
  AND token = '22hGOli2oH0sP/gCQL4ukirVNzk361lb/HuB5Y7HhZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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