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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b24ec5be10aeb72fb5fea0b6532fc8da7846705202fced51688c51253bd8151' 
  AND token = 'GjnCcIck/eOP0UijggLYpnnQNYdJjE0SBxb0K7VmOC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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