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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a8e09b81fa77ecb20c09bd3299ccc84bccc25a58b30e111ac720a1136a907e' 
  AND token = '3Adwrmb0fxdqJdVB/t5qwhkHakpS51nAe8yzKlKZc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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