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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b974f815cebc0b656b8965e26d1b4375a878989e665cf69ff5506a9002d7940' 
  AND token = 'FV49iIcrnH7bhyJFQm+05ObWnZ7hPevWLHkS8F5ntZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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