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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0fa6e572dc9d68a30e1a8e094ceabb8093cf1f83bfc6f4909f93aeb891fd8a' 
  AND token = 'f5VExWgmI/um0aeuJeppcHvtx3jnQ2UdcvgI0lo63y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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