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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b3fcf1b0abed4102f15260e3ecd005014a11ad0eac4f63ea127bd42b837343' 
  AND token = '8AWhvQWjrNRMXnH3XVu8I3hyUBQfdtv2MXRq/GhqyDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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