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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34571d2cee53d042e0e167440f8f9ee4ff28f2e3097ffdc1f6c6569eac0e1e2' 
  AND token = '1xQjhR8TC1Dx6GBGgO9Endv+W8btCZRevI6Q8nI9CXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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