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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38bfbb81838b9ed89293b1a0bd961052e9135efd6ee6a92857ea18577383e37' 
  AND token = 'J862LH/RzFNabYCr3bbk+5lVkMD9VHS3T9kh5gwf0wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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