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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8ceff04d5a420cf81e10f2539b7f9e0a97a32c079c3efd6aaff6f1ac5a1219' 
  AND token = '/sKTLVm5kLHgKV0H/Fb8QlbfuNmXEXwtWVijL4j8PQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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