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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8504be3672de3c132fd6b69a0ab13b141fa956235c7ffaddfbc696c3441782c' 
  AND token = 'M/+y4t7A+XNzxe0SqbMKuxP6Z6h7pR5TbV84hPPmQ3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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