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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508850ebf14014a35dcae71880d294dc25e039a8775232b73b12473484018d24' 
  AND token = 'SdsIRvRbRHfZD3qTqwIKUY8FyLzZpdUI/rpiwx26GN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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